CVE-2026-52933

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When IO_POLL_CANCEL_FLAG\n(BIT(31)) is set in poll_refs, the value becomes negative in\nsigned arithmetic, so the >= 128 comparison always evaluates to\nfalse and the slowpath is never taken.\n\nFix this by casting the atomic_read() result to unsigned int\nbefore the comparison, so that the cancel flag is treated as a\nlarge positive value and correctly triggers the slowpath."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached by local `io_uring_setup()`/`io_uring_enter()` submissions of poll and cancel operations, not by remote packets or physical access.\nAC:L - An attacker can create the ring, choose pollable file descriptors, submit cancels/removes, and generate concurrent wakeups; the race participants are attacker-controlled.\nPR:L - With the default `io_uring_disabled=0`, an unprivileged local user can create and use io_uring; no real root or init-namespace capability is required.\nUI:N - Exploitation does not require another user to mount, open, or process anything; the attacker drives the syscall and file-descriptor activity directly.\nS:U - This is a kernel request-lifetime/ownership bug within the same host kernel security authority, not a VM, IOMMU, or separate security-scope escape.\nC:H - The signedness bug defeats the poll_refs overflow/ownership slow path after cancellation, allowing ref-bit wrap and duplicate ownership/completion of an `io_kiocb`; that is UAF-style kernel memory corruption with plausible memory disclosure.\nI:H - The same duplicate ownership/completion and request lifetime corruption can plausibly be shaped into arbitrary kernel memory modification or control-flow compromise, so integrity impact is high.\nA:H - At minimum, corrupted poll ownership and duplicate completion can trigger kernel warnings, NULL dereferences, UAF crashes, or hangs in a local 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the race participants are attacker-controlled.\nPR:L - With the default `io_uring_disabled=0`, an unprivileged local user can create and use io_uring; no real root or init-namespace capability is required.\nUI:N - Exploitation does not require another user to mount, open, or process anything; the attacker drives the syscall and file-descriptor activity directly.\nS:U - This is a kernel request-lifetime/ownership bug within the same host kernel security authority, not a VM, IOMMU, or separate security-scope escape.\nC:H - The signedness bug defeats the poll_refs overflow/ownership slow path after cancellation, allowing ref-bit wrap and duplicate ownership/completion of an `io_kiocb`; that is UAF-style kernel memory corruption with plausible memory disclosure.\nI:H - The same duplicate ownership/completion and request lifetime corruption can plausibly be shaped into arbitrary kernel memory modification or control-flow compromise, so integrity impact is high.\nA:H - At minimum, corrupted poll ownership and duplicate completion can trigger kernel warnings, NULL dereferences, UAF crashes, or hangs in a local attacker-controlled loop."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea", "lessThan": "81bf96b0abbfa4cd47ea32e12596aed3855fb2f3", "versionType": "git"}, {"status": "affected", "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea", "lessThan": "cf522703d4f194991615763697ae25a3f9539763", "versionType": "git"}, {"status": "affected", "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea", "lessThan": "fc47043f3d9af3efa407665b47f8378ec691ba18", "versionType": "git"}, {"status": "affected", "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea", "lessThan": "ea0697129807d718037f618221037aa0660ee3c5", "versionType": "git"}, {"status": "affected", "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea", "lessThan": "c6d191164dc81838d8dbf452a6000f68c558d1ae", "versionType": "git"}, {"status": "affected", "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea", "lessThan": "326941b22806cbf2df1fbfe902b7908b368cce42", "versionType": "git"}, {"status": "affected", "version": "4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048", "versionType": "git"}, {"status": "affected", "version": "bc4e6ee16778149811333a969a7a893d4cc110c5", "versionType": "git"}, {"status": "affected", "version": "5.15.82", "lessThan": "5.16", "versionType": "semver"}, {"status": "affected", "version": "6.0.11", "lessThan": "6.1", "versionType": "semver"}], "programFiles": ["io_uring/poll.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.1"}, {"status": "unaffected", "version": "0", "lessThan": "6.1", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.86", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.27", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.4", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["io_uring/poll.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3"}, {"url": "https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763"}, {"url": "https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18"}, {"url": "https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5"}, {"url": "https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae"}, {"url": "https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/poll: fix signed comparison in io_poll_get_ownership()\n\nio_poll_get_ownership() uses a signed comparison to check whether\npoll_refs has reached the threshold for the slowpath:\n\n if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS))\n\natomic_read() returns int (signed). 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When IO_POLL_CANCEL_FLAG\n(BIT(31)) is set in poll_refs, the value becomes negative in\nsigned arithmetic, so the >= 128 comparison always evaluates to\nfalse and the slowpath is never taken.\n\nFix this by casting the atomic_read() result to unsigned int\nbefore the comparison, so that the cancel flag is treated as a\nlarge positive value and correctly triggers the slowpath."}], "id": "CVE-2026-52933", "lastModified": "2026-11-10T13:19:20.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52933", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:22:58.731719Z", "version": "2.0.3"}}]}, "published": "2026-06-24T08:16:23.480", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: io_uring/poll: fix signed comparison in io_poll_get_ownership()", "id": "2492097", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492097"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1024", "details": ["A flaw was found in the Linux kernel's `io_uring/poll` component. A logic error exists in the `io_poll_get_ownership()` function due to an incorrect signed comparison. This flaw prevents the necessary slowpath from being triggered when the `IO_POLL_CANCEL_FLAG` is set, potentially leading to unexpected behavior or resource mismanagement within the kernel."], "name": "CVE-2026-52933", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52933\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52933\nhttps://lore.kernel.org/linux-cve-announce/2026062433-CVE-2026-52933-815c@gregkh/T"], "threat_severity": "Moderate"}

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